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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca628c8d2a273c1f6ee890676d90c6ace13ef8eda2b6b21c8b7cd508ef432b5' 
  AND token = 'pLCi8wlMh5H/XvQT0Cl23hnp9AHmlvVgHbqV+w8WS74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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