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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fdf1d5062292513b3d143853abd1365e03bbdeb2c1b0fe26a5666df2e37265b' 
  AND token = 'F/alc52fokIrvgha+beKgsTt429HrNWjaa9oxCA0ggA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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