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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc36c154086ada839de1631b0aa921cdc12e6375cb08123238b9a5d21d87d88b' 
  AND token = 'Q68SrVGW05X1PlYXnQWF9tZwzBV+fiQn3xY8ORkQ5fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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