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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c372a00cd44266fa5088c9368ca770cb162787932c076f3f7137e71cedcddae' 
  AND token = 'jDKG2olP1sw6dMW2cUmq3CRkrjRc12zXx5TuHCM/oYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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