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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed9b6a2ec4057f41c14514b56fbd0ac7f406f948af8249ba7eb24642c66c13cf' 
  AND token = 'V094qjX47M0UnQdpWm40JxOy1wU/tr6mNjE6AhIVZj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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