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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45e13280e0cd30df7e987985a08fb2628f801ae9af972def645882da7ce263c2' 
  AND token = 'SCXYEF+wuc8ASffFSCJxjXKQ8y8wJrdF6U+wItAQ6c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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