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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a01aeeb6006d8a6c6a85a62e90001f109a4d1d47da5f9908288cd58381618215' 
  AND token = 'OpGOtfSPFQcIUhbntCkULCZ6eLR9ZN2xSFlzTULOq54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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