SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfebdc6010a9f41d733787f68ef68237d38529d75165c77dcbf4bd680f6f4ee1' 
  AND token = 'Ohd+iClEaqeQLFrt+KRRhV6HbKXcjsBKpZgSavu/wfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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