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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0562580b4be8f79e8e2517a2bb352d0ab4f0a4a57990a4975e9570325e1a14e' 
  AND token = 'NdoIBXO/qkbFR1cH8wnOU2pfoPVwvqhE3PkQG9ej1Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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