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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf4f08b318fcd1e607d51719889fc75fce6a36017195cb02f1ab4bda7a906e17' 
  AND token = 'iOea2Ui1kW9+6zAYxu63ajEjj+3RWu5L3uxhrlt/j78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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