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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4070c71cda95e3845c83543e9fd1e30b2f4a84e6aaaa368ea813e4d8dbca76b7' 
  AND token = 'afqwoaRwqZe3DVqNDWSLVmWcSzHXhTzZoR+myFojBsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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