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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d2d6b03c4638d1ab38ad2d96a315a9c2b3489c8de4a35cc7df9cf1014b2c10e' 
  AND token = 'oHaYqFy9J7AQLOgmJkTFhLuc2Vevf2xI0Kwu2lX7oNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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