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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a90dd0d8555b2d8cbb348462c318f93a7a18ccc99862e537bad0d702ab9d6e2' 
  AND token = 'fq7TPo53aXZtnGtZLJ96kO2pt9Dox9lWzLJY91cy/yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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