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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3097f82705c2f36a2d20e5ebef9c1cccb1424a4209b4803a31bb6af9baaa7604' 
  AND token = 'fNaz8uer+RHVi8XXt+dTetc6+vsEfgewy5c0DWaX+6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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