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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2eff1a3735a8f3f978677f615fb4fd8988fea210957ac29839e6bf8b8401229' 
  AND token = '4NfhiZRORufm0mQOp4oyllLwzONffy8JPxe5LL+HPGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}