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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8679110cfb8507ab42b95ddf7a0115e183c933add80713eb9b5f9e5a4177c902' 
  AND token = 'KIIbW1v6L019vN1k5FHxT+3rI6Ja2WncyiHTmy6Xxm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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