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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b36e451b6805314e1875c451f2a4a09f0568ed33a1ddd6b83a08fed24616546' 
  AND token = '1L5JhAJhjn6Mr4kiSTpgjoLWgFNA+RPXhoEg8SiYU1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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