SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caebf1f9f19792ea4a022885b081946db433721d95e2a8a149a4728dd0ea545d' 
  AND token = 'i1zKJD5vZkBFlvqSdm+ypBQav6BxYA1fHNOvXnjBxYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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