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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1638306f7371d4ee69a66db05ea28bb58b86a9df99864f6f00f5765a0fddc3c' 
  AND token = '5xisdD3u/rUgzC98szyQJ1rYWM0OWeWxZrKorpyVKUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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