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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a210eb6d6faa32f1a06080670de71d809193adff0e5f2acc63181d68c06cbc50' 
  AND token = 'mtZDe8TD8QQpK6v3fV8/R/EQ+BXEHqzxiw05geQDJB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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