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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a3ced37c72bf062eeb4c09a306ed868a07411a883b50f2d6bbc901e58681cb2' 
  AND token = 'vghWwDQbWWOjrxj1T6a8YoxFnMtta5CGyjiHiCu/nVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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