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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c645746a93feadaa601737cdb9f41639e9be2a8935e632c2388ea6e158efb87' 
  AND token = 'SGB538ymaBFc1kHPW8odkifB5b5LAWWlCd/e7h9rji0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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