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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e9821ffa0779cc0e5a32ff506a36493d51d0fb7ff8b3617a304c6818c8e34c9' 
  AND token = 'acwRiCcX/Xb/m0qWuzWX9AL4XI1rxO7Y84TIaA/4AMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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