Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc99b9148a1e644e853d818b3843f33acd8ad4851328895b641e10de3293b16c' 
  AND token = 'mP2IFvAA05UqB3dfBQCOO83gebAO3mKiotssY8d1CKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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