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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56c0a5a7bab409a7bc8905f7354fb87b3c5821aa4d2c303a8ba98a8f760f1b09' 
  AND token = '4cAJS2pRatAQOMt2WXqP24n+xEXqKcNxjZv4GWjczm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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