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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90cbccb4869568940f736af64b8d8b23b07a956f4ae063fd6cfb2e2fc488b0a8' 
  AND token = 'jgZef2E5YolF2RJVUnramxWtzJr1dlCZH25Jjqz1Na8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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