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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32a42ccccb3748a71bd3b87f927a62188dd87dda811b77d1f6764d5239a3c13d' 
  AND token = 'aAnI5PyLonzj6d/9oQYAwJU+NA5FG8MkCp4mulmbc/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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