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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6142fc6628dfaac8d4b20c15336c984f91603b71cd28458088f0b0b204314bb' 
  AND token = 'TKKotQ+Rk17sc3dcVNKb1peem/hRTQZapotwt3gqEGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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