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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '020a7aa409fa1d0271ab337502945feb225ac238fd131536c4193ac3578d61aa' 
  AND token = 'bHp8nFaHfAo3OgNR7uysw+qdIPlkmzMgnM1LbeLpoEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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