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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42f62d33408a425b5130493ad00a206bf25b13e57624e8273ebca021e3a9bea3' 
  AND token = 'HUUhakVgnDAV2w2L7Cx26cfjK3RR/cIpjt1MvTvhYs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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