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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3bdc4e0836fc796913d63e855c4cbab7461c14fb05923b565f2cdc20c9916b9' 
  AND token = 'N8PQc60PZXREILODO7dwH+VKWJwf4L3krJs+Ou1aFHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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