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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2646c3688ed88db4ad55f0e6c5a449aaccd6e87922787c459d79d963f2a3cf0f' 
  AND token = 'B34SUfLSU4rTDjS6MC4rubxhSYI3k3omSpf45v1ULDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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