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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fca5a620c482f66e8f5bda639e35eb0cf0f516647a8a76c8a3a81f56f6213463' 
  AND token = 'LMepeVXot/Gnr8dAsYzbcaKsjlU1qIdkOsMuCUMgk3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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