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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddd069162b4c5e8348c18299539c4b139dd39fb54f5fb135a47e406d26beeb0f' 
  AND token = 'NquimlRdb5ck/vC3faifdplP+d3YLSNSSmMwzsmBn+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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