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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ff6284178fdac5273fe2548242c2ffcb7c5d2d91898ddbe41239eedcd28f7fd' 
  AND token = 'g7i5WBP8QKE4+QCe9kQ6Do8/4MvWJ73legfLTaN6YA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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