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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a24d5ea6d7e06d522f035f181702b9280abd1a5e334a334787f73e011d8f2078' 
  AND token = 's34+zwnlyopEWOEIniueHe8sc0xPck+2efLn7+ms+B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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