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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '414e4f81362a144b169a159e4a970e7ef97649f6d2a38d1d5f2db59f06e77917' 
  AND token = 'SsQUrBKLGc8dSSvx7HntRkL6O7IbcywlxDhM3bj+h2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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