Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '692d8f43964920d471ce48d4647caf6a0d4da3aef6bc0f0ac4a457c67d9c36aa' 
  AND token = 'RbXl3Aw7YjJaeeMmvMTB9B3DPlhwtIHRrWIThcev0yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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