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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8fcba81e1e23abd006722b5500d3922297499fb298cec91b7f9b1e39cb2d2ac' 
  AND token = 'lyFqRy2PK002SpcaJmvd5tJYzwriXp9W+3dh/FHfA+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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