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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d493cd02f7854126bb22d5cf8cfa6098ced359f3f171d244f6ec8e20f72a21b' 
  AND token = 'mgh9E/u2vvC9DTG36g8JEtsnq6c3O7CG2qvA2rYLCes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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