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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c34f8a77d58fc5e92923a90c2469fee94e3bfd4dbd96366f84f304cc1fc95de' 
  AND token = 'fc176mbNCQshOCidGmcMDLl453ACOkb5Sk6+8f7tn6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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