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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb0be92b9e51c5c85dd668d089a7e04dfb13db1eaa602d99840b16f9712fb6eb' 
  AND token = '+tp3+Ncf1Cd+1K6EWhU2pyDO5zln6tIxBTg6LdLRo40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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