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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9172eb5a6ebd9b367640721b26cb9a889ba431f8b41b57989965af624ce7b84b' 
  AND token = 'CDyhWXa4pXWvMLBn6W9n4yviiU+PsYGGV7FnTtEGMG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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