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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84c8a2de3c909112908e66bab4a78158510131f0f8563a18dfa0390cf29c14d3' 
  AND token = 'xJRc88C8hrv2JfQmu4Duc+rpDuqDYULzbzX1u6uER0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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