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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a26ed1837aa6e66f326f6eec43044c7f3c5ceca61f5c9c9eded4f295074cc2ca' 
  AND token = 'C/mTARJVE2V4qrnB2B+ciCal63rxupn5ZriBojDQ9zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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