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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a906c5d50b41b6a8b030b7cb84467a5990a545607f35a6af69be2b75d5e7c364' 
  AND token = '7SSJ4OSU4UFrEW1R4csh9Px5x1bLtK0fpNch4qoPhTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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