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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7bbcca5448bffcd7edd2cdfd53058914fec1857e892013ff4aea3b8c232d851' 
  AND token = 'UXZhaJnfutY5EF0yDGvGnIMtGEjZ1FKJddGRq9P7Db4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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