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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e25f80e6d8773866619cff51cdee03543e4b75bde39e746f0cefaaa4833c9d8' 
  AND token = '/2zOjmH08hhbRp60tmYJtHq4Gymdjl/zEO2+j/cc/rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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