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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40f452a6c08525fee3ec7738d3d75c9989f215237652077fdf5e2faebca0ed39' 
  AND token = 'J6Zmrc06aF1LCVxd/NI6juIy4iz6sHoE4zH9N/9oEFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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