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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e69048d04c3c54184637736630d13d2623e57b9975916f4353cc179b47802500' 
  AND token = '3iaazZhXSKzefcYQbWD8KQ8TYxMv75H21yuOx1Y4HNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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